Combination vacuum and compression pump



April 7, 1953 N. D. SHURSON 2,634,047 1 COMBINATION VACUUM AND COMPRESSION PUMP Filed March 5 1950 a Sheets-Sheet 1 IN VENTOR. Warmarzfl Sfizzrsan A1113 RN EYS April 7, 1953 N. D. SHURSON 2,634,047

COMBINATION VACUUM AND COMPRESSION PUMP Filed March 5, 1950 3 Sheets-Sheet 2 I II j 1 I N VEN TOR.

ATTU RN EYS April 1953 N. D. SHURSON 2,634,047

COMBINATION VACUUM AND COMPRESSION PUMP Filed March 5, 1950 s Sheets-Sheet :s

IIIIQII" Fl 1a 85 a4 4/ 4 4a INVENTOR.

War/wan Z Sfiw zsan ATTDRN EYS Patented Apr. 7, 1953 2,634,047 I wOOMBINATION VACUUMANDCOMPRESSION PUMP- 1 I 1 I' Norman D. Sjhurson, Sandwich, q I Application March 3, 1950, Serial No. 147,379

. This invention relates to a utility pump particularly adapted for milking machines,or supplying water under pressure or for general farm and other uses, and in particular the invention relates to a pump having a cylinder with a piston therein and in which an arrangement of valves in a cylinder head makes it possible to set the pump for suction or compression whereby.

by settingthevalves the pump functions as a compressor or vacuum pump.

The purpose of this invention is to provide a general utility unit particularly adapted forfarm, use so that the same pump may be set to provide vacuum for some farm equipment, and compression for other equipment.

Various types of pumps and compressors have been provided for farm and other uses but separate and independent units are required for supplying vacuum and compression and as the small farmer seldom has use for pumps and compressors it is necessary to maintain two pieces of equipment, both of which remain idle most of the time. With this thought in mind this invention-contemplates a commonunit, the cost of which is substantially equivalent to either one of the units and which by manipulation ofvalves therein is adapted for use as either a compressor or'vacuum pump. The object of thisinvention is, therefore, to provide means for arranging valves in combination with-the head a pump whereby the same pumpicylinder is adapted for use as a vacuum pump or compressor; x Another object of the invention is to provide a combination vacuum pump and compressor in which the connections for vacuum and compression are provided through the same elements.

"A further object of the invention is to provide a combination vacuum pump and compressor which is of a simple and economical construction. a With these and other objects and advantages in viewthe invention embodies a pump unit having a cylinder with a crank case and a piston actuated by a crank shaft in which a head positioned on the cylinder is formed with a dividing partition with intake valves on one side of the partition and compression valves on the other and in which connections through the sides of the cylinder head may open the respective sides of the head to the atmosphere or connect the head to a tankor the like.

Other features and advantagesof the invention will appear from the following description taken in' connection with the drawings, wherein: Figure l is an end elevational view of the com ,1 Claim; (01130-42 bination vacuum pump and compressor showing vacuum and compression connections extended from opposite sides of the head to a tank.

- Figure 2 is a vertical section through the pump illustrated in Figure lbeing taken on line 2-2 thereof.

Figure 3 is a plan view of the pump with part broken away showing the interior of one end of the head.

Figure 4 is a cross section through a cylinder head taken on line 4-4 of Figure 3 and showing the valve connections extended from opposite sides of the head. i i M Figure 5 is a cross section taken on line 55 of Figure 3 showing the compression valves.

Figure 6 is a similar section taken on line 6-B of Figure 3 showing the vacuum valves.

Referring now to the drawings wherein like reference characters denote corresponding parts the combination vacuum and compression pump of this invention isiormed with a cylinder block l0 having a head H with the block provided with a cylinder l2 having a piston I 3 therein and a cylinder l4 having a piston l5 therein, and the head is provided with vacuum valves l6 and I! in one side and compression valves. [8 and I9 in the other, and the vacuum side of the pump is provided with a control valve 20 with a similar control valve 2| on the compression side.

The pistons l3 and I5 are connected by connecting rods 22 and 23, respectively to a crank shaft 2-4which is journaled in a section 25 at the lower 'end of the cylinder block by bearings 26 and 21. The bearing 26 is mounted in a hub 28 and a cover plate 29 is secured to the outer end of the hub by screws 30. The end 3! of the crank shaft extends through the bearing 26 and a driving pulley 32, which is secured to the shaft-by a key 33, is carried by the outer end of theshait. The bearing 21 is mounted in a hub 34 on the opposite side of the section 25 of the crank case and a cover plate 35 is secured to the outer end of the hub 34 by screws 36. i

The crank shaft section of the cylinder block i0 is mounted on a flanged Spacing element 31, a web 38 of which, is provided with a drain plug 39. The element 31 is mounted upon a tank 40 on a rim 4| having a flange 42 around the upper end thereof and a corresponding flange43 of the element 31 is secured'to the flange 42 by bolts 44. The upper end of the spacing element 31 is secured to the lower'end of the crank shaft section of the cylinder block by bolts 45 that are positioned in flanges 46 and4! "of the cylinder block and spacing element, respectively.

The cylinder head II is provided with a base 48, the edge of which extends outwardly providing a flange 49 by which the head is bolted to a flange 50 on the upper end of the cylinder block by bolts The cylinder head is provided with a cover plate 52 that is secured to the peripheral wall of the head by bolts 53.

The cylinder head is provided with a longitudinally disposed centrally positioned partition 54 that divides the head into two complementary chambers with the vacuum valves I6 and IT positioned in a, chamber 55 positioned on one side of the partition and with the compression valves I8 and I9 positioned in a chamber 56 on the other side of the partition. The cover plate is also provided with a centrally disposed partition 57, the lower edge of which registers wi'th the upper edge of the partition 54 and with a gasket 58 pcsitioned between the abutting surfaces of the cylinder head and cover plate the connection between the two elements is sealed.

As illustrated in Figure 6 the vacuum'valves 'I 6 and I! are provided with stems 59 and 59, respectively and the stems are slidably mounted in and extend upwardly through webs 6i and 62 in the cylinder head. The valves are held upwardly by springs 53 and 84 withwashers 95 and 65, respectively secured on the ends of the stems 59 and Gil by pins 61 and 58. By this means the vacuum valves are resiliently held upwardly in the valve seats 59 and "III with the valves closed and as the piston -I 3 start downwardly the valves are drawn away from the valve seat so that air or other fluid'inay be drawn into the cylinder I2 through-the control valve 29 provided the valve element H is positioned against the seat 72 in the lower part of the valve, as shown in Figure 4. With the valve in'this position air or other fluid is drawn inwardly through an inlet connection I3 with the air passing through an opening i4 around the threaded stem I5 of the valve element and through the connection 16 and the chamber 55 from whichit passes into the cylinder. The opening I4 "is provided in an intermediate partition TI 'and'a valve seat I8 that coacts with the upper surface of the valve element TI is formed inthe lower surface of the partition.

The valve element H is carried on the lower end of the threaded valve stem 55 and the stem I5 is threaded in a plug I9 which is threaded in the upper end of the control valve 29. The stem I5 is provided with a knurled head or disc 89 by which valve element I'I may be moved from the seat E2 to the seal; it when it is desired to use the device as a'vacuum pump.

The compression valves I8 and I9 are provided with stems 8| and 82, respectively and the stems are slidably mounted in lugs 83 and 84 in the cylinder head. The Valves are resiliently held downwardly against valve seats 85 and 86 by springs 81 and 88, respectively, the upper end of the springs being held in socket 89 and 90 on the under surface of the cover plate 52. The lugs 83 and 84 are provided with slots 9| and 92, respecof the chamber 551s provided with an inlet connection 95 and a connection 96 on the opposite side thereof extends into the open chamber 56,

as shown in Figure 4. The valve is provided with avalve element 96', similar to the valve element II and the valve element is positioned to seat against a valve seat 91in a partition-98 when the device is used as a compressor, and against the valve seat 99 in the lower part of the valve casing when the device is used as a vacuum pump wherein the control valve 2| is used as an exhaust for the vacuum. The valve element 95' i carried on the lower end of a threaded valve stem I and the stem is threaded in a plug IDI of the control valve 2|. The upper end of the valve stem IE0 is provided with a knurled disc or head I92 by which the stem is rotated to adjust the position of the valve element.

The control valve 20 is connected, through the lower end thereof to the tank 40 by a tube I03 that is connected to the control valve 20 through a pipe bend I94, and to a nipple I05 on the tank, through a union I99.

The control valve 2| on the opposite side of the pump is connected to the tank 40 by a tube I01 with the upper end of the tube connected to the valve by a pipe bend I08 and with the lower end of the tube connected to the tank through a nipple I99 with a union I It].

With the parts positioned as illustrated in Figures 2 and 4 and with the pump driven by a belt on the Wheel or pulley 32 the air is drawn inwardly with the down strokes of the pistons, the air passing through-the connection 73', the opening I4 and the'connecti'on 16 into th vacuum chamber 55 from which it is drawn into one of cylinders, and with the up stroke of the piston the pressure of the air opens one 'of the valves I8 or I9 whereby the air is forced through the connection 96, into the tank 49 through the tube IU'I. With the valves in this position the device functions as a compressor, drawing in air from the atmosphere and compressing the air in the tank 49.

With the positions of the valves II and '96 re-- versed wherebythe valve element TI is positioned against the seat "I8 and the valve element 96 is positioned against the seat 99, downward movement of either p'i'sto'ndra'ws one of the valves I6 or H downwardly whereby air, or other fluid is drawn through the-tube I03, passing through the opening in the valve's'eat I2 and through the connection 16 into the chamber 55 and the suction opens one of the valves IE or IT whereby air is drawn from the tank 49 into one of the cylinders I2 0r I4. With the upward movement of the piston the air 'or other fluid is forced upwardly through one of the valves I8 or I9 and into the chamber 55 from which it passes to the atmosphere, the valve element 96' being positioned upon the valve seat 99 in the lower part of the valve.

The improved combination of compressor and vacuum pump of this invention may be placed directly on a tank and by setting the valves in one position air and other fluid may be Withdrawn from the tank to provide a partial vacuum in the tank, or by setting the valves in another position air may be compressed in the tank.

The crank case is provided with an oil filler plug III with a gage H2 thereon and a tube I|3 extends from the plug as shown in dotted lines in Figure 1.

It will be understood that modifications may be made in the design and arrangement of the parts without departing from the spirit of the invention. 7

What is claimed is:

In a combination vacuum pump and compressor the combination which comprises a cylinder block havin a plurality of cylinders therein, a crank shaft J'ournalled in thecylinder block, pistons in the cylinders, connecting rods connecting the pistons to the crank shaft, a cylinder head positioned on the cylinder block having a longitudinally positioned partition separating the cylinder head into chambers, a cover plate positioned on the cylinder head and also having a longitudinally disposed partition registering with the partition of the cylinder head, intake valves positioned in the cylinder head and providing communicating means with the cylinders, means resiliently holding the intake valves in closed position whereby the valves open with suction in the cylinders, said intake valves positioned in one of the chambers of the cylinder head, exhaust valves positioned in the other chamber of the cylinder head and also providing communicating means with the cylinders, resilient means holding the exhaust valves in closed position whereby the exhaust valves open with compression in the cylinders, a first control valve having a separate inlet connection and a separate outlet connection which outlet connection is connected to the intake valve chamber, a second control valve having a separate outlet connection REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,124,573 Zimmer Jan. 12, 1915 1,219,373 Byers 1 Mar. 13, 1917 1,462,857 I-Iiller July 24, 1923 1,982,264 Naab Nov. 27, 1934 2,134,077 Ehret Oct. 25, 1938 2.406.202 Crittenden Aug. 20, 1946 

